问题 解答题
求未知数x.
(1)0.4:0.25=
12
x

(2)0.6x+
1
10
x-0.2=1
1
5
答案

(1)0.4:0.25=

12
x

0.4x=0.25×12,

0.4x÷0.4=3÷0.4,

x=7.5;

(2)0.6x+

1
10
x-0.2=1
1
5

7
10
x-0.2=1
1
5

7
10
x-0.2+0.2=1
1
5
+0.2,

7
10
7
10
=
7
5
÷
7
10

x=2.

单项选择题
单项选择题